Rewrite the strjoin function in ES5 without using the rest operator.

In ES5, there is no rest operator, so to implement the strjoin function, which accepts an arbitrary number of arguments, you can use the arguments object — a special array-like object available inside functions.

Example implementation:

function strjoin(separator) {
  var args = Array.prototype.slice.call(arguments, 1); // get all arguments except the first
  return args.join(separator);
}

// Usage:
console.log(strjoin(", ", "apple", "banana", "cherry")); // "apple, banana, cherry"

Here, separator is the first argument of the function, and the rest are collected into the args array using slice. Then, the standard join method is called to concatenate the strings.